Both players discarded their entire hands, then drew new cards.
Max said, "Next, I activated the Spell Card 'Over-the-top Clockwork' from my hand! This card lets me select one 'Wind-Up' monster in my Graveyard and Special Summon it in Face-up Defense Position."
With a flick of his fingers, a second identical Spell Card appeared behind the one in his hand.
"I activated two copies of 'Over-the-top Clockwork' from my hand, allowing me to revive two Wind-Up monsters from the Graveyard." Max revealed the two Wind-Up monsters in his Graveyard. "I Special Summoned 'Clockwork Dog' and 'Clockwork Rabbit' from my Graveyard!"
[Clockwork Dog, DEF 900] [Clockwork Rabbit, DEF 600]
"The effects of monsters summoned by 'Over-the-top Clockwork' are negated. They cannot be Tributed or used as Synchro Material," Max said. "But they can be used as Xyz Material!
I overlaid the level three 'Clockwork Dog' and 'Clockwork Rabbit'! I constructed the Overlay Network with two monsters and performed an Xyz Summon!"
The two tiny Clockwork monsters turned into beams of light and shot into the sky, crossing as they overlaid and vanished into a vortex. From the exploding Light Pillar came a surge of seawater, followed by a heavy steel warship breaking through the waves. Riding atop white foam, it actually resembled an aircraft carrier.
"Clockwork Carrier - Clockwork Mothership, Xyz Summon!"
[Clockwork Carrier - Clockwork Mothership, ATK 1500]
"Ooh, the carrier is out." Kira clapped enthusiastically.
This thing had been a devastating weapon during the Wind-Up era, a forbidden armament that had once been thrown onto the Forbidden/Limited List because the Deck was far too overpowered for competitive play.
As for why it had been banned—
"Clockwork Mothership's effect lets me detach one Xyz Material to Special Summon a 'Wind-Up' monster from my Deck,"